1203231621 has 4 divisors (see below), whose sum is σ = 1604308832. Its totient is φ = 802154412.

The previous prime is 1203231611. The next prime is 1203231629. The reversal of 1203231621 is 1261323021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1203231621 - 2¹⁵ = 1203198853 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1203231629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200538601 + ... + 200538606.

It is an arithmetic number, because the mean of its divisors is an integer number (401077208).

Almost surely, 2^1203231621 is an apocalyptic number.

It is an amenable number.

1203231621 is a deficient number, since it is larger than the sum of its proper divisors (401077211).

1203231621 is an equidigital number, since it uses as much as digits as its factorization.

1203231621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401077210.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1203231621 is about 34687.6292213809. The cubic root of 1203231621 is about 1063.6116335287.

Adding to 1203231621 its reverse (1261323021), we get a palindrome (2464554642).

The spelling of 1203231621 in words is "one billion, two hundred three million, two hundred thirty-one thousand, six hundred twenty-one".